/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePartyInterface.h
Notification when party data is updated
typedef TMulticastDelegate_FourParams< void, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) &, const [FOnlinePartyId](API\Plugins\OnlineSubsystem\FOnlinePartyId) &, const [FName](API\Runtime\Core\UObject\FName) &, const [FOnlinePartyData](API\Plugins\OnlineSubsystem\Interfaces\FOnlinePartyData) & > FOnPartyDataReceived